Quick Answer (TL;DR):
10DLC (10-Digit Long Code) Registration is the standardized carrier framework requiring businesses sending application-to-person (A2P) SMS/MMS messages over standard 10-digit phone numbers to register their brand identity and campaign use cases with The Campaign Registry (TCR).
The Industry Framework:
Mandated by major U.S. mobile network operators (MNOs) through CTIA guidelines, 10DLC registration regulates commercial messaging traffic. Unregistered A2P traffic is subject to carrier filtering, heavy per-message carrier surcharges, and direct blocking.
Operational Implication:
- Brand & Campaign Vetting: Senders must register EIN details, authorized corporate representatives, sample message templates, and verifiable opt-in workflow URLs.
- Throughput Limits: Trust Scores assigned during vetting dictate message-per-minute (MPM) and daily volume allowances across mobile networks.
- Carrier Surcharges & TCPA Alignment: Carrier 10DLC approval does not replace TCPA compliance; valid PEWC and functional STOP opt-out automation remain mandatory across all commercial SMS campaigns.
Related Guide:
See complete messaging requirements in our TCPA compliance checklist for outbound campaigns (2026 update).